Saw-guide.



z PATENTED JUNE 25, 1907 0. F. GIFFIN. SAW GUIDE.

APPLICATION TILED NOV. 27,'190 6.

THE NORRIS PzrEns C0,, WASHINGTON, n. c,

UNITED. STATES PATENT OFFICE.

OSCAR F. GIFFIN, OF SAN FRANCISCO, CALIFORNIA.

SAW-GUIDE.

Specification of Letters Patent.

Application filed November 27,1906. Serial No. 345,292.

Patented June 25, 1907.

To all whom it may concern.-

Beit known that I, OSCAR F. GIFFIN, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Saw Guides, of which the following is a specification.

This invention relates to improvements in saw guides, and is an improvement upon my invention for which Letters Patent of the United States were granted to me on Nov. 20th, 1906 No. 836,110, the object of the invention being to provide a saw-guide which will be more durable in construction and convenient in use than that disclosed in said patent.

In the accompanying drawing, Figure 1 is a plan View of the saw-guide; Fig. 2 is an end view thereof; Fig. 3 is a side View; Fig. 4 is a broken section on the line 44 of Fig. 1; Fig. 5 is an enlarged broken section of parts adjacent to the hinge; Fig. 6 is an enlarged side view of the same.

Referring to the drawing, 1 indicates a plate adapted to rest upon the piece of wood to be sawed, and to the under side of said plate is secured a bar 2, which, for lightness, is made channel-shaped, and is adapted to rest against the straight edge of the wood. To said bar is pivoted, as shown at 3, a guidesupporting-plate 4, to which is hinged, as shown at 5, a guide-plate 6. The guide-plate may be stiffened in any suitable manner as by bending the ends at right angles, as shown at 7 or by other means known in the art. Secured by screws 8 in blocks 9 on the inner side of said guide-plate 6 is a guide 10 formed of half-round wire bent in the form of a U, the sides of which are spread, as shown in dotted lines in Fig. 2, the ends of the wire guide being bent back on themselves so as to be secured in said blocks on the inner side of the guide-plate, while the main portion of the wire extends downward along the outer side of said guide-plate at a convenient distance therefrom to receive and guide a saw between said plate and guide. The guide-plate is cut down or beveled at the front end, and the front arm of the guide is also lower than the rear arm, so as to conform with the downward and forward inclination of the back edge of the saw when in use. Integral with the guide-supporting plate 4 is a horizontal limb or arc 11 formed with a circular slot 12. A bolt 13 extends upward from the channelshaped bar 2, and is clamped at any position in said slot by means of a thumb nut 14, a lock nut 15, being also provided to firmly lock the thumb nut, thereby securing the guide-supporting plate at any desired angle with the bar 2 and with the straight edge of the wood. Graduations 16 are provided to indicate the angle of inclination of the guidesupporting plate to the straight edge of the wood which is being sawed.

The guide-supporting plate 4 is extended or flared outward, as shown at 18, to form a support for the back of a vertical limb or are 19, secured, as shown at 20, to the front angular portion 7 of the guidelate, said arc having a circular slot 21 t rough which passes a bolt 22 firmly secured to said eX tended portion 18, the arc 19 being secured in any desired position by means of a thumb nut 23 on the bolt 22 and a lock nut 24, so as to give the guide-plate and guide the desired inclination to the vertical.

By making the graduated arc 11 in one piece with the guide-supporting plate 4, several advantages are obtained. The clamp nut 14 forms a very convenient mode of securing the device at the desired angle to the straight edge of the wood; the device is durable and accurate, as the arc, being madein one piece with the guide-supporting plate, cannot become loose or give rise to errors of adjustment; the guide plate can be arranged at a much smaller angle of inclination to the horizontal than with the prior construction. Moreover, this construction permits of using a vertical arc with a circular slot to determine the angle of inclination to the vertical for the extension 18 of the guide-supporting plate 4 forms a back support for said vertical arc, and, in combination with the bolt and thumb nut, retains it in the position to which it has been adjusted. The use of a circular slotted plate for the vertical adjustment is a decided improvement over a circular arm, as disclosed in said patent, as it permits of quicker and more accurate adjustmentof the inclination to the vertical.

I claim In combination, a guide-supporting plate adapted to rest upon the upper surface of the piece of wood to be sawed, a supporting plate having its lower surface in the same plane as the guide-supporting plate, and also adapted to rest upon the upper surface of said wood, a bar secured to the under side of said supporting plate and pivoted to the guide-supporting plate, said bar being adapted to rest against the edge of said wood, a guide plate having its lower edge hinged to the edge of the guide-supporting plate remote from the supporting plate, and a saw guide carried thereby, said guide-supporting plate being formed with a main portion for so resting upon the surface of the Wood, a portion having a circular slot around said pivot and an extension beyond the latter portion, With a terminal edge at right angles to the hinged edge, the bar having a clamp bolt passing through said slot, the guide plate having secured to its end adjacent to said terminal edge a slotted graduated arc in a plane at right angles to said guide plate, whereby it is adapted to move in, contact With said terminal edge, and a clamp bolt carried by the guide-sup orting plate at the latter edge and passing t rough said latter slot, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of tWo subscribing Witnesses.

OSCAR F. GIFFIN.

Witnesses:

D. B. RICHARDS, FRANCIS M. WRIGHT. 

